John's two other sons who lived to adulthood, Benjamin B Shackford, and Charles W. Shackford are also found in the same Eastport census.
Benjamin, age 38, a shipmaster is found twelve pages later with real estate valued at $1400, Harriet, age 36, John E, age 16, Harriet E, age 12, Mariette, age 9, Emma, age 8, Gertrude, age 5. Elizabeth Chambers, age 15 is living with the family.
Charles, a clerk is found right above John living in real estate valued at $200 with Sophia, age 29, Maria, age 10, Silas T, age 7, Edward W., age 4. Mary Underwood, age 29 and Ellen Craig, age 19 are living with them.
This is the last census where we find all three of John's sons as Charles was lost at sea Dec 1853.
1850 US Federal Census, Washington County, Maine, population schedule, Eastport, page 48? (penned), 244 (stamped), dwelling 272, family 360, John Shackford https: familysearch.org/pal:/MM9.1.1/M6V8-HRV; digital images, FamilySearch (http://familysearch.org : accessed 23 December 2013).
"Disasters, &c.," New York Daily Tribune, 1 February 1854, Chas Shackford, master of Brig Esther Shackford; digital images, Fulton History (http://fultonhistory.com : accessed 9 June 2014